The index function takes two arguments. The first argument is the list you would like to search.
The seccond is what you would like to search the list with. If there is no instance of the array
with the value of argument 2 the function will return a blank list. If there is one occurence
it will return the index and if there are multiple occurences the function will return a list of
all of the indexes.
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(define l1 (list 1 2 3 4 5))
(define l2 (list 6 7 8 9 0))
(define l3 (construct l1 l2))

(write (index l3 (list 1 2 3 4 5)))

(define l4 (quote (1 2 3 4 5 bob)))
(write (index l4 (quote bob)))
